Zephyr, a free-spirited surfer living out of her van, finds her life in immediate peril when she is abducted by a shark-obsessed serial killer. Held captive on his remote fishing trawler alongside another victim, she realizes she is being kept as part of a ritualistic game. With hungry sharks circling the boat and no hope of rescue, Zephyr must rely on her resilience and resourcefulness to outwit her captor and escape before she becomes the latest offering to the deep.